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Java > Open Source Codes > org > apache > james > util > watchdog > Watchdog


1 /***********************************************************************
2  * Copyright (c) 2000-2004 The Apache Software Foundation. *
3  * All rights reserved. *
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5  * Licensed under the Apache License, Version 2.0 (the "License"); you *
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7  * may obtain a copy of the License at: *
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9  * http://www.apache.org/licenses/LICENSE-2.0 *
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14  * implied. See the License for the specific language governing *
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17
18 package org.apache.james.util.watchdog;
19
20 /**
21  * This interface represents an abstract watchdog process that serves to
22  * monitor a situation and triggers an action under an implementation-specific
23  * trigger condition.
24  *
25  */
26 public interface Watchdog {
27
28     /**
29      * Start this Watchdog, causing it to begin monitoring. The Watchdog can
30      * be stopped and restarted.
31      */
32     void start();
33
34     /**
35      * Reset this Watchdog. Resets any conditions in the implementations
36      * (time to expiration, etc.) to their original values
37      */
38     void reset();
39
40     /**
41      * Stop this Watchdog, terminating the monitoring condition. The monitor
42      * can be restarted with a call to startWatchdog.
43      */
44     void stop();
45 }
46
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